Comment 23 for bug 308410

Ugh... I can't believe it took someone else to say it for me to realize this, but that's not what happened. I had enabled updates from intrepid-proposed, which updated the kernel to 2.6.27-10, and then removed linux-image, -headers, -restricted-modules and ubuntu-modules for 2.6.27-9. But there were problems with the wireless drivers in -10, so I changed back, but neglected to install linux-headers-generic...

Anyway, thanks, and sorry for taking a bit of your time.